Custom item not appearing for others

[Damascus]

I've made a custom item for my story that is a bag of gold that acts as a non-stackable item. I made a new entity file in my custom story folder that changes the item type and give it an inventory image, and redirect the object in the level editor to it.

However, even though it works fine for me, when I send my custom story to other people, the bag of gold no longer appears. When they open my map in level editor it gives the error message "file index out of bounds." I've double and triple checked to make sure that the path leads to the entity file in the custom story folder and that it was packaged with the zip file I sent. But, it still won't appear for them. Anyone know what the problem might be?